Select the steps and the basis of the valve are as follows: ⑴ choice steps ①according to the use of places, uses, clear the valve in the device or device uses to determine the working conditions of the valve: the medium, working pressure, temperature and so on. ② determine the nominal diameter and connection with the valve pipe connection: Flange, internal (external) thread, welded, clip-on, clamp, card sets and so on. ③ determine the way to operate the valve: manual, electric, electromagnetic, pneumatic or hydraulic, electrical linkage or electro-hydraulic linkage. ④ According to pipeline transportation medium, working pressure, working temperature to determine the selected valve shell and inner parts of the material: gray iron, malleable iron, ductile iron, carbon steel, alloy steel, stainless steel, copper alloy. ⑤ choose the type of valve: closed-circuit valves, regulating valves, safety valves, etc., or the use of the form: switch type, regulation type, safety type. ⑥ determine the type of valve: gate valve, globe valve, ball valve, butterfly valve, throttle, safety valve, pressure reducing valve, steam traps, other special valves. ⑦ to determine the parameters of the valve to determine the valve sealing performance requirements, sealing level or seal leakage; for automatic valves, according to different needs to determine allowed flow resistance, emission capacity, back pressure, and then determine the nominal pipe diameter and seat The diameter of the hole. ⑧ determine the geometry of the selected valve parameters: the length of the structure, flange connection form and size, opening and closing the size of the valve height direction, the size and number of bolt holes connected to the overall dimensions of the valve. ⑨ determine the protective coating requirements of the valve, packaging requirements, transport requirements; determine the valve installation position and posture. ⑩ special needs of the valve should also be determined: the length of the structure, the valve height, dimensions, flow resistance, discharge capacity, flow
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